Tecumseh ah47 unknown ignition part?

[astnmacgto]

Working on a mono with an ah47 on it for a power head, restoring spark and noticed something peculiar. This piece on the outside of the coil housing with the wire attached to it, it has a plunger of some type on it



that plunger rides on this plastic ring on the inside of the flywheel



the plastic ring is connected to two T shaped arms that run through the flywheel, they are spring loaded for some reason.

Anybody know what it is for?

 

[46 Poulan]

May be some type of RPM limiter or Governor to keep it from running away--overspeed-David---Very intresting--Looks like it grounds the points out using ceuntrifical force--Makes me think about a governor on a mechanical fuel injection pump--diesel

 

[HarleyT]

Does the compression change when the button is depressed?

 

[HarleyT]

Or is that button/box above the block? Stands alone?

 

[HarleyT]

Yeah, I would go with 46 Poulan on a limiter/gov.

 

[astnmacgto]

May be some type of RPM limiter or Governor to keep it from running away--overspeed-David---Very intresting--Looks like it grounds the points out using ceuntrifical force--Makes me think about a governor on a mechanical fuel injection pump--diesel

That's a good possibility, only thing is, not sure how it would operate?

 

[astnmacgto]

Or is that button/box above the block? Stands alone?

It does stand alone, only attached electrically

 

[HarleyT]

Looks like the spring loaded weights push the disc downward at a certain speed, but it is hard to tell from here.

 

[astnmacgto]

Looks like the spring loaded weights push the disc downward at a certain speed, but it is hard to tell from here.

That's why I thought too at first but the only direction for the T shaped bars to go is up away from the crank and then outward toward the od of the flywheel, and when the T bars move it actually pulls the plastic piece away from the plunger rather than push it down

 

[HarleyT]

Well then it works the other way.

 

[astnmacgto]

I'll have to do some continuity checking on it

 

[ray benson]

I think 46 Poulan is right, look at page 7 of 13 with TP1-17 diagram.

 

[astnmacgto]

I think 46 Poulan is right, look at page 7 of 13 with TP1-17 diagram.

Yep makes sense, thanks Ray! And David and harley, yall set me on the right track

 

[46 Poulan]

Old Cat mechanic --I have some old sears gear reduction with that engine-but all had spark--wonder if this is common setup--could be rare proto type designed by Smokey Yunic himself--Ohhhhh lets keep this amongst ourselves--$$$ I think I have enough already to retire on!!-David--Thanks for the pics Ray

 

[46 Poulan]

Went back and slowly read the whole governor operation and adjustment--Pretty cool designs--LOTS to tick around with--Right down my alley-love the Cat mechanical goverened fuel injection pumps-built -repaired-troubleshooted them many years . Theory of operation simalar on governors--David--can answer help with Cat problems-just ask